Plot to snaffle small change, so unlike Long John Silver (5)
I believe the answer is:
'unlike long john silver' is the definition.
(Long John Silver only had one leg)
'plot to snaffle small change' is the wordplay.
'plot' becomes 'bed' (a plot of land).
'to snaffle' means one lot of letters goes inside another (snaffle can mean to take or steal).
'small change' becomes 'Ip' (resembles 1p, small amount of change).
'bed' going around 'ip' is 'BIPED'.
'so' is the link.
(Other definitions for biped that I've seen before include "One walking on two legs" , "Creature with two feet" , "Two-legged creature" , "Using two pins" , "Two-footed animal" .)